/*
 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package javax.swing.colorchooser;

final class ColorModelCMYK extends ColorModel {

  ColorModelCMYK() {
    super("cmyk", "Cyan", "Magenta", "Yellow", "Black", "Alpha"); // NON-NLS: components
  }

  @Override
  void setColor(int color, float[] space) {
    super.setColor(color, space);
    space[4] = space[3];
    RGBtoCMYK(space, space);
  }

  @Override
  int getColor(float[] space) {
    CMYKtoRGB(space, space);
    space[3] = space[4];
    return super.getColor(space);
  }

  /**
   * Converts CMYK components of a color to a set of RGB components.
   *
   * @param cmyk a float array with length equal to the number of CMYK components
   * @param rgb a float array with length of at least 3 that contains RGB components of a color
   * @return a float array that contains RGB components
   */
  private static float[] CMYKtoRGB(float[] cmyk, float[] rgb) {
    if (rgb == null) {
      rgb = new float[3];
    }
    rgb[0] = 1.0f + cmyk[0] * cmyk[3] - cmyk[3] - cmyk[0];
    rgb[1] = 1.0f + cmyk[1] * cmyk[3] - cmyk[3] - cmyk[1];
    rgb[2] = 1.0f + cmyk[2] * cmyk[3] - cmyk[3] - cmyk[2];
    return rgb;
  }

  /**
   * Converts RGB components of a color to a set of CMYK components.
   *
   * @param rgb a float array with length of at least 3 that contains RGB components of a color
   * @param cmyk a float array with length equal to the number of CMYK components
   * @return a float array that contains CMYK components
   */
  private static float[] RGBtoCMYK(float[] rgb, float[] cmyk) {
    if (cmyk == null) {
      cmyk = new float[4];
    }
    float max = ColorModelHSL.max(rgb[0], rgb[1], rgb[2]);
    if (max > 0.0f) {
      cmyk[0] = 1.0f - rgb[0] / max;
      cmyk[1] = 1.0f - rgb[1] / max;
      cmyk[2] = 1.0f - rgb[2] / max;
    } else {
      cmyk[0] = 0.0f;
      cmyk[1] = 0.0f;
      cmyk[2] = 0.0f;
    }
    cmyk[3] = 1.0f - max;
    return cmyk;
  }
}
